## jairo330 2 years ago average rate of change (function)

1. jairo330

2. jairo330

3. nphuongsun93

$\frac{f(x)-f(1)}{x -1}$

4. jairo330

then what?

5. nphuongsun93

then you will get your answer ~ you know what's f(x) and f(1)?

6. jairo330

no

7. nphuongsun93

f(x) = 3/(x+4) just as the question gives to find f(1), substitute x = 1 into f(x)

8. jairo330

ok

9. nphuongsun93

i will give you the answer in case ._., cos i gotta go $f(x) = \frac{3}{x+4}$$f(1) = \frac{3}5$$\huge \frac{\frac{3}{x+4}-\frac{3}{5}}{x-1}$then solve algebraically you will get$\frac{-3}{5x+20}$

10. jairo330

thank you